Migration resistant prosthetic stent graft for treatment of abdominal aortic aneurysm

Abstract

A prosthetic stent graft for the treatment of AAA includes a plurality of graft legs, each secured in a deployed position by a sealing gasket within a stent segment of the sealing gasket and to one side of a framing bracket. The framing bracket traverses the diameter of the stent segment and extends axially away, dividing the first stent segment into two portions, each portion for receiving a graft leg of the stent graft. The sealing gasket can include a stabilizer having a second generally cylindrical stent segment, and an extension bracket traversing the diameter of the second stent segment and extending away from the second stent segment. The extension bracket and the first bracket are connected with one another at a mutual generally central position.

The invention claimed is: 
     
       1. A sealing gasket for a prosthetic vascular stent comprising:
 a generally cylindrical first stent segment, having a longitudinal axis, a cephalid end and a caudal end; and 
 a framing bracket comprising a single elongate member and only two pair of support legs on each side of the single elongate member, the framing bracket traversing a diameter of the first stent segment and configured to divide the cephalid end of the first stent segment into two substantially equal sized windows when viewed in cross-section from the cephalid end in plan view, each window configured for receiving a graft leg, the framing bracket being positioned longitudinally offset from the first stent segment and substantially perpendicular to, and symmetric about, the longitudinal axis via the two pair of support legs, wherein the two pair of support legs angle in towards one another, forming an inverted V with an apex and two free ends, and towards the center of the first stent segment, the two pair of support legs are 180 degrees apart from one another and are connected to the single elongate member at their respective apexes in a roof like structure with the free ends of the two pair of support legs extending past the perimeter of the first stent segment thereby forming barbs, the framing bracket also comprising a centrally located connecting member mounted thereto and configured for mating with a delivery device. 
 
     
     
       2. The sealing gasket according to  claim 1 , further comprising a first vascular graft portion supported by the first stent segment. 
     
     
       3. The sealing gasket according to  claim 2 , wherein the first graft portion surrounds the first stent segment. 
     
     
       4. The sealing gasket according to  claim 2 , wherein the first graft portion is secured to the first stent segment. 
     
     
       5. The sealing gasket according to  claim 1 , wherein the sealing gasket further comprises a shape memory material. 
     
     
       6. The sealing gasket according to  claim 5 , wherein the shape memory material comprises one or more of Nitinol and an alloy comprising Nitinol. 
     
     
       7. The sealing gasket according to  claim 1 , wherein the first framing bracket comprises a centrally located connecting member. 
     
     
       8. The sealing gasket according to  claim 7 , wherein the connecting member extends laterally to either side of the first framing bracket. 
     
     
       9. The sealing gasket according to  claim 1 , wherein the first framing bracket is connected with the first stent segment at each side of the first framing bracket by a plurality of support members, the support members forming an angle with one another and connected with the first stent segment at different positions around the circumference thereof. 
     
     
       10. The sealing gasket according to  claim 9 , further comprising a first plurality of outwardly directed barbs positioned on the circumference of the first stent segment and contiguous with the support members of the first framing bracket. 
     
     
       11. The sealing gasket according to  claim 1 , further comprising a plurality of recapture legs connected to the first stent segment and extending axially away from the first stent segment in an opposite direction from the first framing bracket. 
     
     
       12. The sealing gasket according to  claim 11 , wherein the recapture legs are no longer than about a deployed diameter of the generally cylindrical first stent segment. 
     
     
       13. The sealing gasket according to  claim 1 , further comprising a second plurality of inwardly directed barbs positioned on the circumference of the first stent segment. 
     
     
       14. The sealing gasket according to  claim 1 , further comprising a third plurality of outwardly directed barbs positioned on the circumference of the first stent segment. 
     
     
       15. The sealing gasket according to  claim 14 , wherein the third plurality of outwardly directed barbs are contiguous with the first framing bracket. 
     
     
       16. The sealing gasket according to  claim 1 , further comprising two generally opposed sections of compressible sealing foam secured to an inner surface of the first stent segment adjacent to each junction of the first framing bracket with the first stent segment. 
     
     
       17. The sealing gasket according to  claim 1 , further comprising a portion of vascular graft material obstructing the space between the sealing gasket and a graft leg. 
     
     
       18. The sealing gasket according to  claim 1 , further comprising a stabilizer portion, the stabilizer portion having a second generally cylindrical stent segment, an extension bracket generally traversing the diameter of the second stent segment and extending in an axial direction away from the second stent segment, wherein the extension bracket and the first framing bracket are connected with one another at a generally central position of the extension bracket and the first framing bracket. 
     
     
       19. The sealing gasket according to  claim 18 , wherein the first framing bracket and extension bracket are joined at a mutually shared central connecting member at the center of both the first framing bracket and the extension bracket. 
     
     
       20. The sealing gasket according to  claim 18 , further comprising a plurality of longitudinally extending barbs projecting from the second stent portion and in a direction of the extension bracket. 
     
     
       21. The sealing gasket according to  claim 18 , further comprising a second framing bracket traversing a diameter of the second stent segment and extending in an axial direction away from the second stent segment and away from the extension bracket. 
     
     
       22. The sealing gasket according to  claim 18 , further comprising a fourth plurality of outwardly extending barbs on the circumference of the second stent segment. 
     
     
       23. The sealing gasket according to  claim 22 , wherein the fourth plurality of outwardly directed barbs are contiguous with the second framing bracket. 
     
     
       24. The sealing gasket according to  claim 18 , wherein the second framing bracket comprises a centrally located connecting member. 
     
     
       25. The sealing gasket according to  claim 18 , wherein the first framing bracket and the extension bracket separate the first stent segment and the second stent segment by at least a distance sufficient to prevent the first stent segment or the second stent segment from interfering with blood flow to the renal arteries of a human patient when deployed across the renal arterial junction of the aorta.